On Aug 7, 2012, at 11:31 AM, R. Michael Weylandt wrote:
On Tue, Aug 7, 2012 at 11:26 AM, Rich Shepard <rshep...@appl-ecosys.com
> wrote:
The sample data sets that come with the NADA package are limited
to one or
two variables and a censored measurement indicator column. I try to
mimic
examples using my data but keep missing the target.
snipped
Is the appropriate way to use the NADA methods for analyses and
plotting
to subset each chemical separately from the 'chem' data frame? Or,
is there
a syntax other than, for example,
_____
cenboxplot(chem&Vdis, chem$ceneq1, chem$era)
_______________^
Incorrect use of '&' when '$' was intended.
Error in cenros(obs[group == i], cen[group == i]) :
error in evaluating the argument 'obs' in selecting a method for
function
'ros': Error: object 'Vdis' not found
I get the same error when trying to use the 'chem.cast' data frame.
Take a look at with()
Michael
David Winsemius, MD
Alameda, CA, USA
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